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2. PVAR rifle - Wikipedia

   en.wikipedia.org/wiki/PVAR_rifle

   The bolt head is milled from Carpenter 158 steel and the Bolt Carrier Groups are made of AISI 8620 steel. PVAR rifles are installed with one-piece free-floated M1913 quad rail handguards made of 7075-T6 aluminum mounted on a matching proprietary barrel nut. UDMC states that the PVAR system is designed to be easily removed from the front of the ...

3. M4 carbine - Wikipedia

   en.wikipedia.org/wiki/M4_carbine

   The receiver is made of forged 7075-T6 aluminum, while the 14.5 in (368 mm) barrel, bolt, bolt carrier, and fire control group are made of steel; these components can be easily serviced and replaced by unit armories, enabling the addition of enhanced components and thus making the platform readily upgradable.

4. Bushmaster XM-15 - Wikipedia

   en.wikipedia.org/wiki/Bushmaster_XM-15

   The standard XM-15 has a forged 7075T6 aircraft-grade aluminum upper and lower receiver. Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. [2] [4] In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. [5]

5. IWI Carmel - Wikipedia

   en.wikipedia.org/wiki/IWI_Carmel

   The IWI Carmel is a short-stroke, gas-piston operated rifle chambered in 5.56x45mm, similar to the CZ BREN 2 and the FN SCAR-L.The free-floating barrel is chrome lined and cold hammer-forged, with a 1:7 twist rate and available in a variety of barrel lengths: 10.5", 12", 14.5" and 16".

6. List of Colt AR-15 and M16 rifle variants - Wikipedia

   en.wikipedia.org/wiki/List_of_Colt_AR-15_and_M16...

   HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the handguards; M4: Government barrel profile with small portion reduced to 0.575 inches to mount M203 grenade launcher; M4 HBAR: M4 barrel with portion under handguard thickened for sustained automatic fire; Super Heavy: Special Colt bull target/match barrel

7. IWI Tavor X95 - Wikipedia

   en.wikipedia.org/wiki/IWI_Tavor_X95

   In 2014, the IDF announced that in the future (from as early as the end of 2014) some infantry units could start to be issued some numbers of an improved X95, which will have a longer 380 mm (15.0 in) barrel, instead of the original 330 mm (13.0 in) barrel of the X95, and a lighter trigger pull. [33]

8. Close Quarters Battle Receiver - Wikipedia

   en.wikipedia.org/wiki/Close_Quarters_Battle_Receiver

   The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.

9. M16 rifle - Wikipedia

   en.wikipedia.org/wiki/M16_rifle

   The M16's receivers are made of 7075 aluminum alloy, its barrel, bolt, and bolt carrier of steel, and its handguards, pistol grip, and buttstock of plastics. The M16 internal piston action was derived from the original ArmaLite AR-10 and ArmaLite AR-15 actions.